An informal and formal word to describe a small house or room to a friend and a land lord?

Informal: http://dictionary.cambridge.org/dictionary/british/poky
More formal: bijou

Thanks for taking the time to answer the question. Is the formal word used very often in formal written/verbal complaints, the word seems a bit jargony?

fatimah0786a very small house or a small room which isn't spacious enough?

The [house / room] is [tiny / cramped / too small].

We're cramped for space in this [house / room].
There's no room to turn around in this [house / room].
There's not enough room to swing a cat in this [house / room].
We're packed in like sardines in this [house / r

Thanks a lot C.J your reply was very helpful.

fatimah0786 Is the formal word used very often in formal written/verbal complaints, the word seems a bit jargony?

It's often used ironically.